The melting point of helium is approximately -272.2 degrees Celsius (or -458 degrees Fahrenheit). This is the temperature at which helium transitions from a gaseous state to a solid state.
Helium is unique among elements because it does not solidify at atmospheric pressure; it requires increased pressure to solidify. When cooled to its melting point under normal atmospheric conditions, helium remains liquid. This phenomenon is due to its low atomic mass and the weak intermolecular forces present in helium gas.
The behavior of helium provides insights into quantum mechanics and low-temperature physics, showcasing its peculiar properties like superfluidity when it becomes a liquid at very low temperatures.